bonsoir
f (x) = 2 x² + 9 x + 5
f ' (x) = 4 x + 9
4 x + 9 = 8
4 x = - 1
x = - 1/4
f ' ( - 1/4 ) = 8
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bonsoir
f (x) = 2 x² + 9 x + 5
f ' (x) = 4 x + 9
4 x + 9 = 8
4 x = - 1
x = - 1/4
f ' ( - 1/4 ) = 8